In my opinion this UI update is a regression in functionality in terms of the icons being harder to discern and the text being harder to read (and significantly so). And since this affects the entire OS (not just one app) I think the blowback could be just as high even if it isn't as bad as maps was. Hopefully they'll make changes though and I'll eat my words.
Making things more difficult to read is a valid argument for regression. Even if it is for some people (where previously it wasn't) that should be pointed out and complained about (as you are rightly doing ).
The whole brouhaha in the armchair designer community over icons, colors & design is simply nuts though. "Designers" are coming out of the woodwork in droves to prove that they can do better in 1 hour what Johny Ives & Co took many months to do.
